I am trying to get my hands on a movie short that I saw several years
ago on Bravo.  It was called "Middle Passage" (or at least part of its
title was Middle Passage).  The movie is no more than 20 minutes long,
and it is shows a white woman walking through a park, who is being
followed by a group of African-American kids.  She is afraid, but
actually the kids are trying to protect her.

Ideally, I would like to know how to get a copy of this film.  If that
is not possible, I'd like to know contact information of the director
or the film production company, so I can find out how to get this
film.

Hello.

“The Middle Passage” (1994) is available from Direct Cinema Ltd [
http://www.directcinema.com/ ] for $29.95.

To order visit:

http://www.directcinema.com/dcl/title.php?id=182&list=67,181,68,400,69,70,144,145,385,146,205,72,182,386,231,383,74,401,387,359,232,172&alpha=M

Here is the description from Direct Cinema’s site:

“Based on a true story, The Middle Passage features two women -- one
white, the other a teenage African American -- as they simultaneously
face crossing a city park late at night. They are met by four young
African American men who offer to accompany them through the park's
wide, dark spaces…

Running time: 22 min, Year released: 1994”

search strategy: 
“middle passage” “African American youths”
“middle passage” “direct cinema”

I hope this helps.